Letter to the Editor Warm molecular envelope of M giants and Miras: a new molecule forming region unmasked by the ISO SWS
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چکیده
Our observations with the ISO SWS revealed that H2O band at 2.7μm appears as absorption already in an M2 giant β Peg and strengthens towards later M giants. Further, CO2 4.2μm band appears as absorption in an M7 giant SWVir and especially strong in a Mira variable SVir. The excitation temperatures of these molecular bands estimated from their band shapes turn out to be 750 – 1,250K in M giants as well as in a Mira variable. Absorption features of CO and SiO at 4μm region appear to be weaker in cooler M giants and almost disappear in SVir (Mira), suggesting filling in by the emission of CO and SiO themselves. The absorption and/or emission may be produced in a rather warm molecule forming region above the photosphere. This molecular envelope should be related to the quasi-static molecular zone previously suggested from the high resolution FTS spectra of CO in the near IR.
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تاریخ انتشار 1997